.header {
    width: 100%; /* %: 相对父容器 */
    height: 60px;
    background: lightgray;
    border-bottom: 1px solid crimson;
}

.banner {
    width: 100%;
    height: 450px;
    background: lightgray;
}

.per_attention {
    width: 50px;
    height: 22px;
    background: #ff9d00;
    color: white;
    font-size: 6px;
    line-height: 22px;
    text-align: center;
    font-weight: bolder;
    cursor: pointer;
}

/*小圆圈logo*/
.small-logo {
    width: 60px;
    height: 60px;
    background: red;
    border-radius: 30px; /*圆角*/
    font-size: 10px;
    color: white;
    line-height: 60px;
    text-align: center;
    float: left;
}